Upgradeable validation functions (#918)

* upgrade primitives to allow changing validation function

* set up storage schema for old parachains code

* fix compilation errors

* fix test compilation

* add some tests for past code meta

* most of the runtime logic for code upgrades

* implement old-code pruning

* add a couple tests

* clean up remaining TODOs

* add a whole bunch of tests for runtime functionality

* remove unused function

* fix runtime compilation

* extract some primitives to parachain crate

* add validation-code upgrades to validation params and result

* extend validation params with code upgrade fields

* provide maximums to validation params

* port test-parachains

* add a code-upgrader test-parachain and tests

* fix collator tests

* move test-parachains to own folder to work around compilation errors

* fix test compilation

* update the Cargo.lock

* fix parachains tests

* remove dbg! invocation

* use new pool in code-upgrader

* bump lockfile

* link TODO to issue

polkadot/runtime/common/src/crowdfund.rs

@@ -582,7 +582,7 @@ mod tests {
 	};
 	use frame_support::traits::Contains;
 	use sp_core::H256;
-	use primitives::parachain::{Info as ParaInfo, Id as ParaId};
+	use primitives::parachain::{Info as ParaInfo, Id as ParaId, Scheduling};
 	// The testing primitives are very useful for avoiding having to work with signatures
 	// or public keys. `u64` is used as the `AccountId` and no `Signature`s are requried.
 	use sp_runtime::{
@@ -698,6 +698,10 @@ mod tests {
 			code_size <= MAX_CODE_SIZE
 		}
 
+		fn para_info(_id: ParaId) -> Option<ParaInfo> {
+			Some(ParaInfo { scheduling: Scheduling::Always })
+		}
+
 		fn register_para(
 			id: ParaId,
 			_info: ParaInfo,